Page 131 - Math SL HB Sem 1
P. 131
:( lo . Thc follouriag diagra shorvs a sector ofa circle ofradius r cm, and a,gle 6 at the cen..e
The perimeter of tlre sector is 20 cm.
20-2r
G) Shorv that g
r
bnr
O) The rea of the sector is 25 cm!. Finrl the value of r._ ,. 5 ctn
